Investigations on the Influence of Flow Migration on Flow and Heat Transfer in Oblique Fin Microchannel Array

Abstract

In order to scrutinize the coolant mass distribution and its effect to the heat transfer in oblique fin microchannel array, extensive numerical studies are performed on planar oblique fin configuration. Full-domain simulations using common-flow down (CFD) approach are employed to provide better insights into the flow distribution, flow stability, and heat transfer performance at a global level. The flow field and temperature profile analysis shows that nonuniform coolant distribution and coolant migration occur in the oblique fin microchannel, and the heat transfer performance for both edges of the heat sink is affected due to changing secondary flow rate. However, the flow migration does not affect the local coolant velocity and temperature profiles significantly in the middle region (0.2 < Z′ < 0.8). Meanwhile, it is also found that Reynolds number affects the coolant migration, the stability of the fluid flow, and heat transfer performance significantly. Higher Reynolds number increases the percentage of secondary flow rate and, hence, enhances the heat transfer for fin surfaces in secondary channels.

Research progress of the liquid cold plate cooling technology for server electronic chips: A review

“…Then, Lee et al 57 investigated that small hydraulic diameter (104 μm), small oblique angle (27°), and small oblique fin pitch (400 μm) was the most effective combination. Mou et al 58 analyzed the influence of secondary flows at a device level and examined fluid low instability and its effect on flow distribution and heat transfer at high Reynold number with oblique fins. For both water and nanofluid, Vinoth et al 59 studied that oblique finned MCHS with trapezoidal channel cross‐section improved heat transfer efficiency better than square and semicircle cross‐section with higher pressure drop.…”

“…The parameters of fins, especially the geometry, [46][47][48][49][50] spacing, [51][52][53][54] and shape, 52,[55][56][57][58][59][60][61] affect the heat transfer enhancement and pressure drop of microchannels. The friction coefficient and Nusselt number are used to indicate the degree of their influence.…”